XPath - Select Node That Has Atrribute

Question

Is is possible to select nodes IF they have a certain attribute? The nodes I require all have a "data-rel" attribute. I want to select only the nodes that have that attribute, irrespective of the "data-rel" attributes value.

<a href="/someurl.php" data-rel="...">

I've tried ...

List<HtmlAgilityPack.HtmlNode> groups = doc.DocumentNode.SelectNodes("//a[contains(@data-rel)]").Distinct().ToList();

... to no avail.

As a matter of interest, was there anything in the specification of contains() that misled you into thinking this is what the function did, or were you just guessing? As the current editor of the spec, I'm interested to know why people go so badly wrong. — Michael Kay
– Michael Kay, Commented Jul 20, 2013 at 14:43

paul trmbrth · Accepted Answer · 2013-07-20 13:40:07Z

Try //a[@data-rel]

See http://www.w3schools.com/xpath/xpath_syntax.asp

//title[@lang] Selects all the title elements that have an attribute named lang

Reference http://www.w3.org/TR/xpath/#path-abbrev

employee[@secretary and @assistant] selects all the employee children of the context node that have both a secretary attribute and an assistant attribute

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